Want To Display Number With 1sec Delay

I want to display numbers in a TextView like this: Wait 5 sec // then a delay of 1 sec Wait 4 sec // display this in the same text view along with delay Wait 3 sec // display this

Solution 1:

You can use this one

new CountDownTimer(30000, 1000) {

     publicvoidonTick(long millisUntilFinished) {
         mTextField.setText("Wait: " + millisUntilFinished / 1000);
     }

     publicvoidonFinish() {
         mTextField.setText("done!");
     }
  }.start();

This timer class can start at the time of button click and also you can adjust the total time and the tick interval

This is from developer site

Solution 2:

If I understand you correctly, you just want a countdown timer starting at 5 seconds on the click of a button. If so, give this a shot:

publicclassMainActivityextendsActivity
{
    TextView textView;
    Button button;

    privatefinalHandlermHandler=newHandler();
    privateintstartTime=5;
    privateRunnablemTask=newRunnable()
    {
        publicvoidrun()
        { 
            if (startTime > 0)
            { 
                textView.setText("Wait for " + String.valueOf(startTime));
                startTime--;
                mHandler.postDelayed(mTask, 1000); 
            } 
            else 
            {
                textView.setText("Sorry. Times up!");
            }
        } 
    };

    @OverridepublicvoidonCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 

        textView = (TextView) findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(newOnClickListener()
            {
                @OverridepublicvoidonClick(View v)
                {
                    mHandler.post(mTask);
                }               
            }
        );      
    }   
}

Solution 3:

Its very easy, You need to user CountDownTimer class.

Here is a working demo, I just created for you.

MainActivity.java

publicclassMainActivityextendsActivity 
{
    intremaningTime=5;
    TextView textView;
    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById( R.id.txtTextView );
        Buttonbutton1= (Button) findViewById( R.id.button1 );

        button1.setOnClickListener( newOnClickListener ()
        {

            @OverridepublicvoidonClick(View arg0) 
            {
                newCountDownTimer ( remaningTime * 1000, 1000 )
                {

                    @OverridepublicvoidonFinish() 
                    {
                    }

                    @OverridepublicvoidonTick(long millisUntilFinished) 
                    {
                        textView.setText( "Wait " + ( remaningTime-- ) + " sec" );
                    }
                }.start();
            }           
        });
    }
}

main.xml

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><TextViewandroid:id="@+id/txtTextView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:layout_centerVertical="true"android:text="@string/hello_world" /><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/txtTextView"android:layout_below="@+id/txtTextView"android:layout_marginTop="34dp"android:text="Button" /></RelativeLayout>

Solution 4:

Use an AsyncTask, here is some sample code:

...

privateclassCounterTaskextendsAsyncTask<null, null, null> {

    @OverrideprotectedvoidonPreExecute() {
    }

    @OverrideprotectedLongdoInBackground(Uri... uri) {
        try {
            mCount++;
            updateUIHandler.obtainMessage().sendToTarget();
            Thread.currentThread().sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        returnnull;
    }

    @OverrideprotectedvoidonPostExecute(Long result) {
    }
}

publicHandler updateUIHandler = newHandler() {
    publicvoidhandleMessage(Message msg) {
        mText.setText(mCount);
    }
};

mText is your TextView and mCount is your counter, these can be global variables. As iTech has stated you can't update UI from a thread, however you can make a call to a Handler on the UI thread to do the update.

And run the task like this:

new CounterTask().execute(null, null, null);